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We're a community centered around enjoying games as part of a team. No matter what the game is, we aim to play within a team so that we can achieve the maximum enjoyment and pleasure from the gaming experience. We all like to be friendly and communicate to one another using microphones in-game. To find out a bit more about us, please visit this thread here.

What you need to do is find out the gamertag of the map creator, then hit start when you're in-game to bring up the menu where you set your loadouts etc. Scroll down and to the right to File Browser > Map Variants then go to File Search (iirc), this will give you an option to enter a gamertag to view their fileshare. Make sure you add spaces, caps don't matter, but if you have trouble or it says it's empty try replicating all the capitalization in their gamertag.

edit: You can also do Game Mode Variants instead of Map Variants. Some mini game maps have custom variants to use on those maps.